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I've tried changing the purple folder application icon using Pixadex and also using the old Get Info-copy-paste method. The application icon changes in my Finder, but reverts to the original icon in the dock after the application is launched.

Select the app, right-click and select Show Package Contents, go into the Resources folder, edit/replace the <appname>.icns file, which has 4 copies of the icon of various sizes. Or keep any casual borrower of your machine on their toes by substituting the .icns file from other applications :-)